cxl: Workaround malformed pcie packets on some cards (d79e6801) · Commits · 戴 / test

drivers/misc/cxl/pci.c

+28 −0

Original line number	Diff line number	Diff line
		@@ -1035,6 +1035,32 @@ static int cxl_read_vsec(struct cxl adapter, struct pci_dev dev)
		return 0;
		}

		/*
		* Workaround a PCIe Host Bridge defect on some cards, that can cause
		* malformed Transaction Layer Packet (TLP) errors to be erroneously
		* reported. Mask this error in the Uncorrectable Error Mask Register.
		*
		* The upper nibble of the PSL revision is used to distinguish between
		* different cards. The affected ones have it set to 0.
		*/
		static void cxl_fixup_malformed_tlp(struct cxl adapter, struct pci_dev dev)
		{
		int aer;
		u32 data;

		if (adapter->psl_rev & 0xf000)
		return;
		if (!(aer = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR)))
		return;
		pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_MASK, &data);
		if (data & PCI_ERR_UNC_MALF_TLP)
		if (data & PCI_ERR_UNC_INTN)
		return;
		data \|= PCI_ERR_UNC_MALF_TLP;
		data \|= PCI_ERR_UNC_INTN;
		pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_MASK, data);
		}

		static int cxl_vsec_looks_ok(struct cxl adapter, struct pci_dev dev)
		{
		if (adapter->vsec_status & CXL_STATUS_SECOND_PORT)
		@@ -1134,6 +1160,8 @@ static int cxl_configure_adapter(struct cxl adapter, struct pci_dev dev)
		if ((rc = cxl_vsec_looks_ok(adapter, dev)))
		return rc;

		cxl_fixup_malformed_tlp(adapter, dev);

		if ((rc = setup_cxl_bars(dev)))
		return rc;